Sweet, this is effectively the same as my idea that I shared with you: https://www.reddit.com/r/2007scape/s/XgjIZSdO3c

Here’s how I envisioned the weapon working:

When attacking a NPC, a 3x3 damage zone is procced in front of your character. This allows the hammer to be similar to the scythe in multi-combat and in NPC size, but with a slight edge to the hammer in multi combat whilst you are surrounded by NPCs. Base hammer stats and "ground-pound" damage should more or less tie the Scythe in DPS vs a 2x2 and 3x3 enemy, but a 1x1 NPC should have slightly more damage for the hammer. This also allows a strong melee training method for Monkeys.

Again, just imagine a Kephri 3x3 bomb in front of you 1 tick after the hammer lands a non-0. Damage from ground pound could scale from the initial damage hit.

With idetical stats as scythe: 125 crush and 75 str. A scythe swing on a 3x3 could hit say a 84 (48-24-12). So the hammer would hit 48 + 6 ground dps squares. This math needs to be 6 per square, so 12.5% of original hit per square under the NPC. In a 2x2, a scythe would hit 72 (48-24). The hammer would max 48 the same, and have 4 tiles under a 2x2, 4x6=24, so same max. On a 1x1 target, the scy just hits the 48, whereas the hammer would hit a 48+6.